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Use Oracle JET CLI to launch your hybrid mobile application in a browser, simulator, or mobile device for testing and debugging. When you serve your application to a browser or emulator, a live reload option is enabled, and changes you make to the code are immediately reflected in the running application.
LiveReload: The Spring Boot DevTools module includes an embedded server called LiveReload. It allows the application to automictically trigger a browser refresh whenever we make changes in the resources. It is also known as auto-refresh. Note: We can disable the LiveReload by setting the property spring.devtools.livereload.enabled to false. Get Firefox, a free web browser backed by Mozilla, a non-profit dedicated to internet health and privacy. Available now on Windows, Mac, Linux, Android and iOS. Is there a way to have it open up firefox instead of chrome? (note: my system default browser is chrome) I could not find any documentation on this in gulp webserver or gulp livereload either. If you left live reload enabled (default, -livereloadtrue), the terminal window updates to reflect that the code has changed.For example, if you save a change to dashboard.html in an application scaffolded with the navbar or navdrawer template, the terminal window outputs the name of the changed file, and the browser or emulator/simulator updates with the change.
Before you begin:
- Familiarize yourself with the
ojet serve
command optiontheme
when you want to run the application with an optional platform and a custom theme, as described in Customize Alta Themes Using the Tooling. - Optionally, use the
ojet serve
command with the--release
option to serve a release-ready version of your application, as described in Package and Publish Hybrid Mobile Applications. - If you want to send your application to an iOS device, you must take additional steps as described in Package a Hybrid Mobile App on iOS.
At a command prompt, change to the application’s top level directory and use the
ojet serve
command with options to launch the application. Tip:
You can also enter ojet help
at a terminal prompt to get help for specific Oracle JET CLI commands. The application will launch in a local browser, emulator/simulator, or device depending upon the options you specify. The following table shows examples.
Command | Description |
---|---|
ojet serve windows -–browser=firefox | Launches a Windows version of the application in the Firefox browser. |
ojet serve ios | Launches the application in the iOS Simulator using the Alta iOS theme. |
ojet serve android --destination=emulator:MyEmulator | Launches the application in the Android emulator using the AVD named “MyEmulator”. The emulator name is case-sensitive. |
ojet serve android --device | Launches the application on the attached Android mobile device. |
The terminal will also output the names of the files as they are loaded. If your application contains multiple views, the output will reflect the names of the views and associated files as you navigate through the application.
WARNING:
If you specify the Android platform, use a proxy server and skipped the ojet build
step, the serve
command will fail the first time you issue it. To resolve this, create a gradle.properties
file in your HOME/.gradle
directory and rerun the serve command. The file should contain the following:If you left live reload enabled (default,
--livereloadtrue
), the terminal window updates to reflect that the code has changed. For example, if you save a change to dashboard.html
in an application scaffolded with the navbar or navdrawer template, the terminal window outputs the name of the changed file, and the browser or emulator/simulator updates with the change. Live reload is disabled when you serve an application to a device. To terminate the batch job when using live reload, press Ctrl+C in the command window and then enter
y
if prompted to terminate the batch job. About ojet serve Command Options for Hybrid Mobile Applications
Use
ojet serve
to run your hybrid mobile application in a local web server for testing and debugging. The following table describes the commonly-used options and provides examples for their use.
Option | Description |
---|---|
[ios|android|windows] | Desired platform. Enter android , ios , or windows . |
build-config | Specify the path to buildConfig.json . The buildConfig.json file contains details that Cordova can use to sign the application. You do not need this file when building a debug version of your application for Android or Windows, or if you are building your app for deployment to an iOS simulator. However, you must configure one for testing on an iOS device and for pre-release testing of your Android, iOS or Windows application. |
server-port | Server port number. If not specified, defaults to 8000. |
livereload-port | Live reload port number. If not specified, defaults to 35729. |
American truck simulator - christmas paint jobs pack for mac. destination | Specify one of the following:
|
browser[=browser-name] | Equivalent to destination=browser[:browser-name] . |
emulator[=emulator-name] | Equivalent to destination=emulator[:emulator-name] . |
device[=device-name] | Equivalent to destination=device[:device-name] . |
server-only | Equivalent to destination=server-only . |
livereload | Enable the live reload feature. Live reload is enabled by default ( --livereload=true ). Use --livereload=false or --no-livereload to disable the live reload feature. Disabling live reload can be helpful if you’re working in an IDE and want to use that IDE’s mechanism for loading updated applications. |
build | Build the app before you serve it. By default, an app is built before you serve it ( --build=true ). Use --build=false or --no-build to suppress the build if you’ve already built the application and just want to serve it. |
theme | Theme to use for the application. The theme defaults to redwood for hybrid mobile applications. Hp photosmart c5180 software download mac software. Note: If you have migrated to JET 9.0.0 and later, and want to continue building with your Alta theme, for hybrid mobile themes, you can specify: alta:android , alta:ios , alta:windows ). Note that the Alta theme is supported through JET 10.0.0 but is expected to become deprecated beyond that. For details about migrating applications, see Oracle JET Application Migration for Release 10.0.0. You can also enter a different themename for a custom theme as described in About CSS Variables and Custom Themes in Oracle JET for Redwood themes and, for a migrated custom Alta theme, in Customize Alta Themes Using the Tooling. |
themes | Themes to use for the application, separated by commas. If you don’t specify the --theme flag as described above, Oracle JET will use the first element that you specify in --themes as the default theme. Otherwise Oracle JET will build the application with the theme specified in --theme . |
Brackets for mac download. --cssvars | Injects a Redwood theme CSS file that supports working with CSS custom properties when you want to override CSS variables to customize the Redwood theme. For details about theming with CSS variables, see About CSS Variables and Custom Themes in Oracle JET. |
sass | Manages Sass compilation. If you add Sass and specify the --theme or --themes option, Sass compilation occurs by default and you can use --sass=false or --no-sass to turn it off. If you add Sass and do not specify a theme option, Sass compilation will not occur by default, and you must specify --sass=true or --sass to turn it on. For details about theming with Sass, see Work with Sass. Note: The option that you choose controls both Sass compilation in the build step and Sass watch in the serve step. |
platform-options | Platform-specific options that will pass verbatim to the Cordova CLI. This option is typically required for Windows device deployments or if a Cordova plugin contains multiple static libraries for different CPUs. If the value passed contains a quoted string, the quotation marks must be escaped. For example, you can use platform-options to specify Windows architectures. By default, the architecture defaults to anycpu . To specify a single architecture, use the --arch option and specify arm , x86 , x64 , or anycpu . |
Spring Boot DevTools
Spring Boot 1.3 provides another module called Spring Boot DevTools. DevTools stands for Developer Tool. The aim of the module is to try and improve the development time while working with the Spring Boot application. Spring Boot DevTools pick up the changes and restart the application.
We can implement the DevTools in our project by adding the following dependency in the pom.xml file.
Spring Boot DevTools Features
Spring Boot DevTools provides the following features:
- Property Defaults
- Automatic Restart
- LiveReload
- Remote Debug Tunneling
- Remote Update and Restart
Property Defaults: Spring Boot provides templating technology Thymeleaf that contains the property spring.thymeleaf.cache. It disables the caching and allows us to update pages without the need of restarting the application. But setting up these properties during the development always creates some problems.
When we use the spring-boot-devtools module, we are not required to set properties. During the development caching for Thymeleaf, Freemarker, Groovy Templates are automatically disabled.
Note: If we do not want to apply property defaults on an application, we can set configprop:spring.devtools.add-properties[] to false in the application.properties file.
Automatic Restart: Auto-restart means reloading of Java classes and configure it at the server-side. After the server-side changes, it deployed dynamically, server restarts happen, and load the modified code. It is mostly used in microservice-based applications. Spring Boot uses two types of ClassLoaders:
- The classes that do not change (third-Jars) are loaded in the base ClassLoader.
- The classes that we are actively developing are loaded in the restart ClassLoader.
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When the application restarts, the restart ClassLoader is thrown away, and a new one is populated. Therefore, the base ClassLoader is always available and populated.
We can disable the auto-restart of a server by using the property spring.devtools.restart.enabled to false.
Remember:
- The DevTools always monitors the classpath resources.
- There is only a way to trigger a restart is to update the classpath.
- DevTools required a separate application classloader to work properly. By default, Maven fork the application process.
- Auto-restart works well with LiveReload.
- DevTools depends on the application context's shutdown hook to close it during the restart.
LiveReload: The Spring Boot DevTools module includes an embedded server called LiveReload. It allows the application to automictically trigger a browser refresh whenever we make changes in the resources. It is also known as auto-refresh.
Note: We can disable the LiveReload by setting the property spring.devtools.livereload.enabled to false.
It provides browser extensions for Chrome, Firefox, and Safari. By default, LiveReload is enabled. The LiveReload works on the following path:
- /META-INF/maven
- /META-INF/resources
- /resources
- /static
- /public
- /templates
We can also disable auto-reload in browser by excluding the above paths. For example:
We can see the other additional path by using the property spring.devtools.restart.additional-paths. For example:
If we want to exclude additional path and want to keep defaults then use the property spring.devtools.restart.additional-exclude. For example:
Remember
- We can run one LiveReload server at a time.
- Before starting the application, ensure that no other LiveReload server is running.
- If we start multiple applications from IDE, it supports only the first LiveReload.
Remote Debug Tunneling: Spring Boot can tunnel JDWP (Java Debug Wire Protocol) over HTTP directly to the application. It can even work application deployment to Internet Cloud providers that only expose port 80 and 443.
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Remote Update and Restart: There is another trick that DevTools offers is: it supports remote application updates and restarts. It monitors local classpath for file changes and pushes them to a remote server, which is then restarted. We can also use this feature in combination with LiveReload.
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Using a Trigger File
Automatic restart sometimes can slow down development time due to frequent restarts. To remove this problem, we can use a trigger file. Spring Boot monitors trigger file and detects modifications in that file. It restarts the server and reloads all previous changes.
We can implement the trigger file in our application by adding the property spring.devtools.restart.trigger-file. The file can be internal or external. For example:
Spring Boot DevTools Example
Step 1: Create a Maven project using Spring Initializr https://start.spring.io/.
Step 2: Provide the Group name and Artifact Id. We have provided Group name com.javatpoint and Artifact Id spring-boot-devtools-example.
Step 3: Add the following dependencies: spring-boot-starter-web and spring-boot-devtools.
Step 4: Click on the Generate button. It downloads the Jar file of the project.
Step 5: Extract the Jar file.
Step 6: Import the folder to STS. It takes time to import.
File -> Import -> Existing Maven Projects -> Browse -> Select the folder spring-boot-devtools-example -> Finish
When the project imports successfully, we can see the following directory in the Package Explorer section of the STS.
Step 7: Open the SpringBootDevtoolsExampleApplication.java and run it as Java Application.
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After that, make any changes (edit or remove some file or code) in the application, and save that changes. As soon as we save the changes, the server restarts and pick up the changes.
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